Synonyms of the word

unmerciful

• adj. not showing mercy.

bloody

• adj. Covered in blood.
• adj. Characterised by bloodshed.
• adj. (rare in US, Canada, common in Britain, Australia, New Zealand, slang) Used as an intensifier.
• adj. (dated) Badly behaved; unpleasant; beastly.
• adv. (rare in US, Canada, common in Britain, Australia, New Zealand, slang) Used to intensify what follows…
• v. To draw blood from one's opponent in a fight.
• v. To demonstrably harm the cause of an opponent.
• n. (casual) bloody mary.

bowelless

• adj. (obsolete) Without pity.

cutthroat

• n. A murderer who slits the throats of victims.
• n. An unscrupulous, ruthless or unethical person.
• n. A three-player pocket billiards game where the object is to be the last player with at least one ball…
• adj. Involving the cutting of throats.
• adj. Of or relating to a card game where everyone plays for him or herself rather than playing with a partner.
• adj. Ruthlessly competitive, dog-eat-dog.

fierce

• adj. Exceedingly violent, severe, ferocious or savage.
• adj. Resolute or strenuously active.
• adj. Threatening in appearance or demeanor.
• adj. (slang, Ireland, rural) Excellent, very good.
• adj. (slang, US) Of exceptional quality, exhibiting boldness or chutzpah.
• adv. (slang, Ireland, rural) Extremely; very.

hard

• adj. (of material or fluid) Having a severe property; presenting difficulty.
• adj. (personal or social) Having a severe property; presenting difficulty.
• adj. Unquestionable.
• adj. (of a road intersection) Having a comparatively larger or a ninety-degree angle.
• adj. (slang, vulgar, of a male) Sexually aroused.
• adj. (bodybuilding) Having muscles that are tightened as a result of intense, regular exercise.
• adj. (phonetics, not comparable).
• adj. (art) Having a severe property; presenting a barrier to enjoyment.
• adj. (not comparable) In the form of a hard copy.
• adv. (manner) With much force or effort.
• adv. (manner) With difficulty.
• adv. (obsolete) So as to raise difficulties.
• adv. (manner) Compactly.
• adv. (now archaic) Near, close.
• n. (countable, nautical) A firm or paved beach or slope convenient for hauling vessels out of the water.
• n. (uncountable, drugs, colloquial, slang) crack cocaine.

implacable

• adj. Not able to be placated or appeased.
• adj. Adamant; immovable.

inclement

• adj. Stormy, of rough weather.
• adj. (obsolete) Merciless, unrelenting.
• adj. (archaic) Unmercifully severe in temper or action.

merciless

• adj. Showing no mercy; cruel and pitiless.

mortal

• adj. Susceptible to death by aging, sickness, injury, or wound; not immortal.
• adj. Causing death; deadly, fatal, killing, lethal (now only of wounds, injuries etc.).
• adj. Fatally vulnerable; vital.
• adj. Of or relating to the time of death.
• adj. Affecting as if with power to kill; deathly.
• adj. Human; belonging to man, who is mortal.
• adj. Very painful or tedious; wearisome.
• adj. (Britain, slang) Very drunk; wasted; smashed.
• n. A human; someone susceptible to death.

pitiless

• adj. having, or showing, no pity; merciless.
• adj. having no kindly feelings; unkind.

remorseless

• adj. without remorse, mercy or pity.
• adj. unyielding or relentless.

ruthless

• adj. Without pity or compassion; cruel, pitiless.

tigerish

• adj. Having the characteristics of a tiger.

uncompassionate

• adj. Not compassionate.

unkind

• adj. (obsolete) Having no race or kindred; childless.
• adj. Not kind; contrary to nature or type; unnatural.
• adj. Lacking kindness, sympathy, benevolence, gratitude, or similar; cruel, harsh or unjust; ungrateful.

unpitying

• adj. Not feeling or showing pity.